Andrew harkis



" the chamber l) of the inner casing and the annularI 'acted sans' mi i can.

Letters Patent No. 98,162, dated Decemberjll, 1869.

HYDRO-PNEUMATICI GOVERNOR7 The Schedule referred to-n these Letters Patent and making plart of the seine,

I, ANDREW HARRIS, of Philadelphia, county of Philadelphia, State of Pennsylvania, have invented a Hydro-Pneumatic Governor for steam-engines, of which the following is a specification.

Nature and Object of thc Invention..

Description of theAccompanyingDrawing. Figure l is a vertical section of my improved regulator for steam-engines, and

Figure 2, a Inoditication of the same.

General Description.

A is an outer casing, closed at the bottom, and connected at the top, by an annular plate, a1, to an inner casing, B, the lower open end of which is situated at a short distance above the bottom ofthe outer casing, so that there may be a free communication between chamber E, between the two casings.

Water, or other suitable uid, is poured into the chambers, until they are about half full; 4and the inner chamber D contains Aa suitable float, m, connected by a rod, a, to one arm ofa lcv-er, G..

Thus far, my invention is similar to part ot' the regulating-appznatus for exhausters of gas-works, for which Letters APatent were granted to Joseph A. Harris on the 26th day of March, 1867; but in adapting theabove device to a steam-engine, with the view of regulating the speed of the same, I use an exhaustingapparatus, driven by the engine, the exhausting-apparatus consisting, in the present instance, of a simple rotary pump, H, the pulley ott-lle pump being driven directly or indirectly-trom the crank-shaft, or other rotating part ot the engine, and the exhaustpipe -n ct' the pump communicating with the interior ot' the circular chamber E, ator near the top of the same.l v

A tube or cock, q, situated near the toplof "the casing, admits air to the said annulalspace Ej The outer arm of the lever Gis connected, by any suitable appliances, to the throttle-valve of la steamengiue.

y As the exhaust-pump derives its motion, either directly oi' indirectly, from the steam-engine, the exhaustion of the chamber Ewill be commensurate with the speed of the engine. Thus, if the speed ofthe engine be excessive, the air will be exhausted from the chamber E faster than air can pass throughthe pipe or cock q towake its place. `The'rcsult offthis must be the rising 'of the water in the said chamber E, the corresponding loweringof the 'water in the chamber 1), the descent of. the float, .and the closing ot' the throttle-valve to an extent which will insure a'proper reduction in thespeed ofthe engine.

If', on the contrary, the speed of the engine dimin` ish'es,`the water in the chamber D will rise, owingto the supply of air, through lthe cock q, to the annular' channel, being greater than theam ouut of ai r exhausted therefrom, and the consequence will be the opening of the throttle-valve,`and an increased speed of 'the engine. ,l

It willnow be seen, that the movement 'oi' the throttle-valveis effected directly through the agency of water, the movement of the latter through the agency of air, and the-latter heilig under the control ot' the engine; hence', I have entitled my invention a hydro-pneumatic regulator for steam-engines.

This regulator, I have found, by repeated experiments, to be most uniform and sensitive in its-action.

` Hitherto I have referred to the exhaustionot air from the annular chambers, and to the pipe or cock q as an inlet; but it will be evident, that by reversing by causingv the pump to this arrangement, namely, force air into the chamber-,and permitting the air/to escape therefrom through the cocky, the engine can be made to socontrol the water, through the medium of theair, as to operate the iioat, and, consequently. the throttle-valve, with results the same as those described above. l It should here be understood that I do notdesire. to confine myself to a rot-ary pump, for exhausting air from, or forcing air into the annular chamber, as any other blowing or exhausting-apparatus will serve the purpose-providing it bc operated by, and uniformly with the engine.

should be arraugediprecisely as shown in iig. 1 the casing, for instance, may consist ot' a simple square box, A', as shown in tig. 2,a partition, u', extending from the top nearly to the bottom, the iioat being contained in one chamber, and air being admitted to and withdrawn from the other chamheig'above the v water; in fact, a variety of diiiereut arrangements of being eiected Noris it essential that the air and water-chambers chambers may be adopted, without departing from the main feature of my invention.

Claim.

A vessel, containing?r two compartments, comrnnnieating with each other, snbstnntinllyns described, and partly filled with water, or other suitable fluid, in combination with un exhausting or blowing-apparatus, which-is driven by the engine, and by which, in conjunction with an inlet or outlt-cock or tube, the nir is unused to so not on the water, that the latter be-` comes :t medium for operating the throttle-valve of the engine.

In testimony whereof,1 have signed my name' to this specification, in the presence of two subscribing witnesses.

ANDREW HARRIS. Witnesses y WM. A. STEEL, HARRY SMITH. A 

